The Trabzon Castle (Turkish: Trabzon Kalesi) is a fortress located in the city of Trabzon, northeastern Turkey. Constructed on foundations dating back to Byzantine era with cut stones from former structures at site, the castle stretches from a hill on the backside of the city to the Black Sea shore. It consists of three parts, the Upper Fortress (Yukari Hisar), the Middle Fortress (Orta Hisar) and the Lower Fortress (Aşağı Hisar).[1]

The citadel

The Upper Fortress protected the citadel and served as the acropolis. It is believed that the citadel was built as the first construction in 2000 BC. Some early sources mention the existence of ruins of structures such as hippodrome, tower, bath and palace. The citadel underwent various modifications in the history. The walls of the Upper Fortress are higher than of the other parts. It is fortified in the south with higher and thicker walls and towers. Some epigraphs from Ottoman era, which were found between the citadel walls, can be seen in Trabzon Museum.[1]

The Lower Fortress stretches in the west from Zağanos Tower down to the sea. Also this part of the Trabzon Castle was built by Alexios II of Trebizond. However, an inscription with the tughra of Ottoman sultan Mehmed II (reigned 1444–46 and 1451–81) is situated above the gate in the Moloz Tabya (literally: Rubble Bastion). In the east, there are two gates, Pazarkapı (Marketplace Gate) and Mumhane Kapı (Chandlery Gate). Historical buildings around the Lower Fortress are Molla Siyah Mosque (St. Andreas Church), Hoca Halil Mosque, Pazarkapı Mosque, Kundupoğlu and Yarımbıyıkoğlu manions, Sekiz Düzenli Hamam (bath), Tophane Hamamı (bath), Hacı Arif Hamamı (bath) and İskender Pasha fountains.[1]

The most of the city walls are still standing and are among the city's oldest buildings. In fact, their oldest part can be dated back to 1st century AD during the Roman Empire era. Historical sources provide information about older stages of their construction. Xenophon, who visited the city in 5th century BC also mentioned the existence of city walls.[2]

In 1921, some of the remaining Christians of the city, were ordered by the municipal authorities to dismantle the stone of the Comnenos era fortress and use the rumble for road building.[3]